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Stalls when I take off the oil filler cap


howie149

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I just bought a 1989 Carrera and when I go to check the oil (per the proper process with engine running) and take off the oil filler cap it stalls. If I put back the oil filler cap it runs fine. Any ideas on 1) Why and 2) How to check the oil level properly without engine running?

Edited by howie149
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It's stalling due to the fuel mixture going lean. You have a vacuum leak some where and one of the most common causes is the line going to the fuel pressure regulator. When the air filter is serviced the vacuum line often gets knocked off. There is also a black plastic valve connected to the oil tank fill neck which is part of the PCV system and has a vacuum line going to it. The line gets damaged or the valve itself fails and can cause the same fault.

There is no way to accurately check the oil level without the engine running or at temperature.

Edited by wvicary
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